[deploy] Fix register newline literal

src/web/routes/dashboard.ts

@@ -2557,7 +2557,7 @@ router.get('/', (req, res) => {
           .slice()
           .sort((a, b) => (a.sortOrder ?? a.order ?? 0) - (b.sortOrder ?? b.order ?? 0))
           .map((f) => [f.label || 'Feld', f.type || 'shortText', f.required ? 'true' : 'false'].join(' | '))
-          .join('\n');
+          .join('\\n');
       }
 
       function setRegisterFormDefaults() {